Drug & supplement interaction

Arsenic + Pasireotide Diaspartate

Pasireotide Diaspartate brand name: Signifor.

Major Interaction
Medically reviewed by · Updated September 2026
The bottom line Major

Arsenic has a major interaction with Pasireotide Diaspartate. Arsenic trioxide can prolong the QT interval.

Read the full interaction report
SeverityMajor
LikelihoodProbable
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Arsenic and Pasireotide Diaspartate

Here is the interaction we found between these two, with the evidence behind it.

Major

QT INTERVAL-PROLONGING DRUGS

Why this applies to Pasireotide Diaspartate

Pasireotide Diaspartate falls under QT INTERVAL-PROLONGING DRUGS — the group Arsenic interacts with.

Arsenic trioxide can prolong the QT interval.
Up to 40% of patients treated with prescription arsenic trioxide have a prolonged QT interval on their electrocardiogram (ECG). Theoretically, non-prescription arsenic could have an additive effect when combined with drugs that prolong the QT interval.
Severity Major Likelihood Probable Evidence B

Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the concern with these two together. Pasireotide (Signifor) can affect the heart's electrical timing, something doctors call the QT interval. Arsenic, especially the prescription form arsenic trioxide, does the same thing, and in studies up to 40% of people on it showed a longer QT on their ECG. Stacking two things that both stretch the QT can add up, and a very long QT can lead to dangerous irregular heart rhythms, dizziness, fainting, or a racing heartbeat.

This isn't about arsenic being broken down differently. It's simply two heart-rhythm effects pushing in the same direction. There's no good reason to take arsenic on your own, so please skip it and check with your pharmacist or doctor about anything you're taking, including any homeopathic products.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Arsenic Also Interacts With Other Medications

Arsenic has 160 major, known drug interactions in our database — the Pasireotide Diaspartate one above is one of them. If you take anything else, check it against the full list below.

Major 160 No known interaction 2,670 (incl. Pasireotide Diaspartate)
Taking anything else?

Check Another of Your Medications Against Arsenic

Covers the 2,830 medications we’ve checked against Arsenic. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Pasireotide Diaspartate

This page covers Arsenic only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pasireotide Diaspartate page lists 13 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: American Hellebore (major), Cesium (major), Ephedra (major), Grapefruit (major) and Sida Cordifolia (major).

By severity: 6 major · 7 moderate.

From our pharmacist’s overview on the Pasireotide Diaspartate page

“All 13 supplements on this page raise the same concern with pasireotide (Signifor), a drug for Cushing's disease that can itself lengthen the QT interval, the electrical reset time between heartbeats. Stack another QT-prolonging ingredient on top and the risk of a dangerous heart rhythm goes up, so treat these combinations with real care.”

Reviewed by 2 · Jul 18, 2026

Open the Pasireotide Diaspartate interaction page

One more smart check

Taking Arsenic as Part of a Dietary Supplement Product? Check It for Interactions

We hold 4 real supplement products containing Arsenic, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Arsenic. Your product may carry other ingredients that interact with Pasireotide Diaspartate too, on top of Arsenic — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Arsenic and Pasireotide Diaspartate Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Arsenic
Steady interest

#948 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Pasireotide Diaspartate
Top half

#1,393 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Arsenic

What is Arsenic?

Arsenic
  • Homeopathic digestive complaints
  • Traditional remedy for inflammatory conditions
  • Prescription use in certain leukemias (medical, not supplement)
  • Anxiety and restlessness (homeopathic tradition)

Arsenic is a naturally occurring element that is toxic in its inorganic form, and it is not a supplement you should take to improve your health. While arsenic trioxide is a real, doctor-prescribed cancer medicine, and tiny homeopathic doses exist, there is no good reason to take arsenic on your own. Avoid arsenic-containing products and talk to a pharmacist or doctor about any concerns.

Read the full Arsenic monograph & all interactions
Medication

About Pasireotide Injection

What Is Pasireotide Injection Used For?

Brand name: Signifor

Signifor (pasireotide subcutaneous injection) is used to treat Cushing's disease — a condition caused by a pituitary tumor that makes the body produce too much cortisol — in patients for whom pituitary surgery is not an option or did not cure the disease.

Signifor LAR (a long-acting intramuscular form of pasireotide) is approved to treat both acromegaly (a condition where the pituitary gland makes too much growth hormone) and Cushing's disease, in patients who have had an inadequate response to surgery or for whom surgery is not an option.

See full Pasireotide Injection drug information
Keep checking

Other Drugs & Arsenic

Browse every other medication we’ve checked against Arsenic — both the ones with a known interaction and the ones without. Select any drug for the full detail.

160Major
0Moderate
0Minor
2,669No known interaction
160 Major 2,669 No interaction
Major

160 interactions

Showing 60 of 160 major interactions — see all 160 on the Arsenic page.

No interaction 2,669 drugs checked — show the list

We also checked Arsenic against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,669 medications checked with no known interaction — see the full Arsenic list.

See the full Arsenic interactions page
See every supplement checked against Pasireotide Diaspartate, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Arsenic monograph › Uses, safety, and every drug interaction in one place Pasireotide Diaspartate supplement interactions › Every supplement checked against Pasireotide Diaspartate, ranked by severity Pasireotide Injection drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Arsenic and Pasireotide Diaspartate Together: Common Questions

Can you take Arsenic with Pasireotide Diaspartate?
This is rated a major interaction, so the combination is best avoided unless your doctor or pharmacist has specifically told you otherwise. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Arsenic and Pasireotide Diaspartate interaction?
We rate it Major. This is a clinically significant combination that is generally best avoided, or used only under the direct supervision of your physician or pharmacist.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Still Have a Question About Pasireotide Diaspartate and Arsenic?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.